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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1091

AI-Based Business Model Innovation : Case study at Axis Communication

Ohlsson, Johannes January 2022 (has links)
Background  AI adoption is increasing, and the highest increase of AI is seen in service functions, followed by product applications. Moreover, the patent filing is rapidly increasing showing high interest in the technology. Product-based firms developing AI technology may need to develop their business model as a result of the introduction of AI. Research aim This thesis aims to explore how product-oriented companies innovate the business model based on AI development. More specifically, how these technological opportunities can, create value, deliver value, and capture value as a result.    Method This thesis follows a qualitative strategy, mainly being explorative. The thesis follows a single case study approach of Axis Communications. Data collection was mainly conducted with semi-structured interviews. Findings The value creation of AI development is described based on functions and the value-added. The value delivery explores key capabilities of the data pipeline, algorithm development and partners. The value capture described the sales model and compares AI-related solutions with competitors. Conclusions The study concludes that AI-based solutions can be an attributing factor for a product-based company to innovate the business model towards a more service and partner-oriented business model. Keywords: Artificial intelligence, Internet of things, Digital servitization, Business model innovation, Business ecosystem
1092

Songbird-mediated Insect Pest Control in Low Intensity New England Agriculture

Mayne, Samuel J 21 March 2022 (has links)
Global agricultural intensification has caused large-scale wildlife declines, but agricultural lands that maintain natural habitats can support healthy wildlife populations and receive significant ecosystem services from these natural communities. However, how on-farm biodiversity results in beneficial ecosystem services is highly variable and is reported to differ among taxa and guilds. One group that has attracted attention for their potential beneficial role in reducing pest abundance are birds. Understanding the role of bird communities and individual species in pest control could be important for managing farms under a low intensity agroecological framework. In New England, farmers are increasingly applying low intensity agricultural practices, and these low intensity farms have high conservation value for bird communities. The value of bird communities to on-farm productivity, however, remains poorly understood. Therefore, we quantified the amount of insect pest control provided by birds to three important crops to New England farmers: brassicas (e.g., kale, broccoli), cucurbits (e.g., squash, cucumber), and Solanaceae (e.g., eggplant, potato). We also examined the role of different songbird species in the provision of pest control in this system. To determine the amount of pest control services provided by birds in this system, we conducted an exclusion experiment at nine low intensity farms in Franklin and Hampshire counties of Massachusetts. Birds were excluded from crops, and pest abundance and leaf damage were compared between exclusion plots and immediately adjacent control plots. In brassica crops, the abundance of imported cabbageworm (Pieris rapae) and diamondback moth (Plutella xylostella) were significantly reduced, while cabbage looper (Trichoplusia ni) was not significantly affected. In cucurbit crops, all life stages of squash bugs (Anasa tristis) were significantly reduced, though striped cucumber beetle (Acalymma vittatum) populations were not significantly changed. In Solanaceous crops, bird presence caused significantly larger populations of Colorado potato beetle (Leptinotarsa decemlineata) larvae, while the other life stages of Colorado potato beetle and aphids (superfamily Aphidoidea) were not significantly affected. Leaf damage was reduced by bird presence in all three crop types, though this effect was only significant for cucurbits. The varied effects of bird predation in different crop types highlights the need for crop-specific knowledge in applying agroecological pest management in New England. To determine the roles of different bird species in insect pest control, bird diets were studied at 11 low intensity farms in western Massachusetts. DNA metabarcoding was used to determine the frequency of crop pests and pest natural enemies in fecal samples collected from birds on each farm. We found evidence of pest species being consumed in 12.6% of the 737 total fecal samples collected, while pest natural enemies were present in 2.0% of samples. Among bird species, Gray Catbirds and Common Yellowthroats were determined to feed on crop pests significantly more frequently than Song Sparrows, while no bird species effect was found for natural enemy frequency. The only crop pest surveyed in our exclosure experiment which was present in fecal samples was Colorado potato beetle. Though birds preyed on Colorado potato beetle, they also preyed on two known predators of Colorado potato beetle eggs and larvae: Chrysopa oculata and Chrysoperla rufilabris. This provides evidence that the increase in Colorado potato beetle larvae we observed when birds were present was due to ecological release. Combined, our results show that birds provide important, though variable, insect pest control services on low intensity New England farms. Bird predation had primarily beneficial impacts on crops, suppressing abundance of several pest species and decreasing or minimally affecting leaf damage. The effects of bird predation on pest abundance and damage can be integrated into farm management to control insect pests without reliance on expensive, and sometimes damaging, outside inputs like pesticides. Promotion of woody, non-crop habitats on farms can promote species like Gray Catbirds and Common Yellowthroats that feed more frequently on insect pests. Management of New England farmlands for bird pest control may support healthy bird communities and improve agricultural output.
1093

Ekosystemtjänster : - med exempel från Flens kommun / Ecosystem services : - with examples from Flen

Ekström, Amanda January 2018 (has links)
Ekosystemen bidrar med många olika tjänster som är en förutsättning för att människans och samhällets behov ska kunna tillgodoses. Av den anledningen är det av största vikt att hänsyn tas till ekosystemtjänsterna och att de planernas för i stads- och samhällsplaneringen. Bland Sveriges miljömål finns ett par etappmål som handlar specifikt om ekosystemtjänster. Där framgår att vikten av ekosystemtjänsterna samt vad de påverkas av ska identifieras. Ekosystemtjänster kan delas in i fyra olika kategorier: Reglerande-, försörjande-, kulturella-, och stödjande ekosystemtjänster. De stödjande tjänsterna är en förutsättning för övriga tjänster och kan vara till exempel jordmånsbildning och geokemiska kretslopp. De kulturella tjänsterna är tjänster som bidrar till människans välbefinnande och hälsa, såsom friluftsliv och estetiska värden. De reglerande tjänsterna fås från naturens reglering vilket kan vara reglering av vattenflöden eller klimat. De försörjande tjänsterna är produkter som fås av naturen såsom livsmedel och vatten. Ekosystemtjänsterna påverkas av klimatförändringarna som innebär varmare och torrare klimat med risk för mer extrem nederbörd, exempelvis våtmarker riskerar att torka ut. Samtidigt är ekosystemtjänster viktiga då de motverkar effekter av klimatförändringarna. Bland annat minskar risken för översvämningar på grund av naturens förmåga att reglera vattenflöden och även hindra vatten från att nå markytan.   Syftet med rapporten är att identifiera ekosystemtjänster i Flen samt beskriva dess koppling till klimatförändringar. Resultatet kommer att fokusera på reglerande och kulturella ekosystemtjänster vilka har en stor betydelse i den bebyggda miljön. Resultatet fås och presenteras genom en litteraturstudie och inspiration från Metrias, Naturvårdsverkets, Huddinge kommuns och Högskolan i Gävles arbete med identifiering av ekosystemtjänster genom att studera ett områdes marktäcke. En karta tas fram över marktäcket i Flen och ekosystemtjänsterna presenteras sedan i en tabell, kopplande till marktäcke. Flens kommun består av mycket skog och sjöar. Där finns även åkermark och våtmark. Dessa marktäcken bidrar med många viktiga ekosystemtjänster från samtliga kategorier. / Ecosystems provide many different services that are essential for meeting human and social needs. For this reason, it is very important that ecosystem services are taken into account and are an important part of the urban planning. Among Sweden's environmental goals, there are two goals to achieve, that deal specifically with ecosystem services. The goals describe that the importance of ecosystem services and what they are affected by should be identified. Ecosystem services can be divided into four categories: regulating services, provisioning services, cultural services, and supporting ecosystem services. Supporting services are essential for the three other services. Two different supporting services is for example soil formation and geochemical cycles. The cultural services are services that contribute to well-being and health, such as outdoor activities and aesthetic values. The regulating services are obtained from nature’s natural regulations, which can be for example the regulation of water flows or the climate. The supply services are products obtained from nature such as food and water. Ecosystem services are affected by climate change, which means warmer and drier climate with the risk of more extreme precipitation, for example wetlands risk to become dry. At the same time, ecosystem services are important as they prevent the effects of climate change. For example, the risk of flooding is reduced due to the nature's ability to control water flows and also prevent water from reaching the ground surface.   The purpose of the report is to identify ecosystem services in Flen and describe its connection to climate change. The result will focus on regulating and cultural ecosystem services which are of great importance in the built environment. The result is obtained and presented through a literature study and inspiration from Metria, the Swedish Environmental Protection Agency, the town of Huddinge and the University of Gävle's work on identifying ecosystem services by studying an area's ground cover. A map is drawn over the covered area in Flen, and ecosystem services are then presented in a table linking to the ground cover. Flen consists of a lot of forests and lakes. There are also farmland and wetlands. These ground covers contribute many important ecosystem services from all four categories.
1094

Pollinerare, ekosystemtjänster, avkastning, pollinator, ecosystem services & yield

Lidén, Linnea, Melander, Anders January 2019 (has links)
Ljudet av surrande insekter har blivit mer sällsynt på senare år och det finns en risk att det kommer bli en betydlig minskning av det i framtiden. Det menar i alla fall oroande forskarrapporter. En stor del av insekterna kan var utrotningshotade och det innebär i sin tur en risk för hela ekosystemet. Ekosystemtjänsterna kopplade till det svenska jordbruket från pollinerare är försörjande och reglerande. Kulturella tjänster från pollinerare finns också, i form av friluftsliv och bärplockning bland annat. Några viktiga pollinerare i Sverige är steklar och mer specifikt humlor och bin. Av de 299 vilda biarterna i Sverige är en tredjedel hotade. Jordbruket är i behov av pollinering för de grödor där självpollinering inte kan ske, dessa är till stor del frukt och grönsaker men även raps. Raps är till viss del självpollinerande, forskningen pekar på att skörden mognar jämnare och avkastningen blir bättre vid en högre närvaro av pollinerare. Detta är av stor vikt för att det ska vara lönsamt att bedriva jordbruksverksamhet därför bör dessa värna om denna ekosystemtjänst som pollinerare bidrar till. Denna rapport tar upp situationen för pollinerare i Sverige och hur de bidrar till olika ekosystemtjänster, fokus ligger på rödlistade arter och dess hot och problematik. Hur närvaron av pollinerare påverkar skörden och avkastningen av raps undersöks för att försöka uppskatta det ekonomiska värdet av pollinerare. En mindre fallstudie genomfördes för att vidare se hur förutsättningarna ser ut för pollinerare i ett begränsat område. En litteraturstudie har legat som grund för denna studie och har begränsats till den data som finns. För pollinerare har det funnits information om steklar (humlor och bin), en geografiskbegränsning till Öland och ett område utanför Gårdby gjordes. I fallstudien framkom det att observationerna av pollinerare skedde sporadiskt och att det finns kunskapsluckor i det valda området. Därför är det viktigt att vidare öka intresset och kunskapen om hur människor varje dag påverkar och nyttjar ekosystemtjänster från pollinerare. Hoten och problematiken identifieras ett av dem var förändrad markanvändning, i form av att förutsättningarna för att överleva inte längre är de samma. Det kan ta sig formen av ett intensifierat jordbruk där tillgången på en varierad föda inte längre finns men också att boplatser växer igen. En lösning till den hastiga förändringar i markanvändningen är att odla mer ekologiskt och ta tillvara på de naturliga områden då de bidrar till en hög biodiversitet. Detta motverkar även intensifieringen av jordbruket som idag går mot att bestå av stora monokulturer. Det andra hotet var insektsmedel generellt, då det har visats att det kan ha en negativ påverkan på pollinerare då främst på deras larver och ägg. Därtill är rekommendationerna för produkttester väldigt korta vilket resulterar i att de fullständiga effekterna alltid syns. Problematiken med insektsmedel har två lösning, en där odling i större utsträckning sker ekologiskt och att genomföra längre tester. Övriga potentiella hot är den överhängande klimatförändringen, sker det en snabb förändring förändras förutsättningarna drastiskt. Även inplantering av odlade pollinerare kan potentiellt vara ett hot då de kan konkurrera ut de vilda pollinerarna. / The sound of buzzing insects have become more scarce in the last several years and there is an overhanging risk that There will be a major decrees of them in the future. There is some scientific research that claims so, and that is worrying. A big part of the insects could be endangered and that would mean that the existence of ecosystems is at great risk. Farming in Sweden relies on several ecosystem services from pollinators, mainly provisioning and regulating. There are some cultural services from pollinators as well, that mostly affects outdoor life and the picking of berries among others. Some of the important pollinators are bumblebees and bees. Out of the 299 wild species that live in Sweden a third is threatened. Farmers are in need of pollination of the crops that don't self-pollinate, these crops are mainly fruit and vegetables but also oilseed rape. Oilseed rape is to some extent self-pollinating, but research shows that the yield ripens more evenly and the turnover of the crop is increased by a higher level of presence in the field by pollinators. This is of great interest for the farmers to make their business profitable, therefore they should work to preserve the ecosystem services that pollinators contribute with. This report attends the situation of pollinators in Sweden and how they contribute to ecosystem services, it's focused on red-listed species and their threats and problems. Also how the presence of pollinators affects the yield of rapeseed oil is investigated to try to estimate the value of pollinators. A smaller case study was conducted to further see how the conditions for pollinators are in a limited area. A literature study has laid the path for this study and it has been limited to the data available. for pollinators information about bees and bumblebees have been available, and a geographic limitation to Öland and to an area outside Gårdby was made. A small case study was conducted to further show the condition of pollinators in a limited area. It was shown that the observations of pollinators were sporadically conducted and there was a lack of knowledge in the chosen area. Therefore it's important to further increase the interest and knowledge about how humans affects and uses the ecosystem services from pollinators every day. The identified threats was a change in land use, to such an extent that it affects the conditions of surviving. It could be caused by intensified farming were the access to sufficient food is no longer available to pollinators. Increased land use changes the natural habitats where pollinators build their nests, either because they overgrow or they are exploited to uninhabitable ground. A solution to this is ecological farming where natural regions contribute to a greater biodiversity in the landscape are seen as a resource and preserved. The increased intensification of farming land will decrease if a large part of the farming is done ecologically. The second threat was pesticides in general, it has been shown that it could have a negative impact on pollinators, and mostly the larva’s and eggs. In addition to that, the recommendation on how long to test for the effects of a pesticide is very short. These problems with pesticides have two solutions, one was an increase in ecological farming and also to conduct longer test periods for pesticides. Other potential threats that were identifies was the overhanging climate change, conditions would drastically change. A presence of domesticated pollinators could be rival to native pollinators and lead to a decrease of native pollinators.
1095

An Evaluation of the Iowa State University Ecosystem

Mazer, Cherie 01 January 2014 (has links)
Purpose - This dissertation in practice is an evaluation study conducted at Iowa State University, entitled, Learning Ecosystem Assessment Review of Needs (LEARN). The evaluation posed these questions: (a) What educational technologies are currently used and what technologies will be needed in the future? (b) What are the attitudes and practices of faculty and students toward online and blended learning? (c) What academic technology support services are used? What are the perceptions of the support provided for the application of academic technologies? Methodology/design - The study was a mixed-methods design employing interviews with deans and focus groups and surveys of faculty and students. Findings - Iowa State University faculty and students use a wide array of academic technologies both in physical and virtual classrooms. The prevailing sentiment regarding the need for future academic technologies is not for new offerings and new features but for easier to use, more reliable technologies, and more timely support. Although Iowa State University has formally adopted online learning by offering numerous programs and courses, the university is in the early stages of adopting blended learning. Implications - The results and implications of the study inform the university on next steps to ready the institution for leveraging technology and preparing for the transformation toward strategic adoption of online and blended learning. The author outlines an organizational learning approach to manage change and promote adoption of blended learning.
1096

Go Fish: An Analysis Of Economic Rents In Panamanian Fisheries Against Ecosystem Service Values

Glassner, David 01 January 2013 (has links)
Global demand of fish for consumption in developing nations is expected to continue to rise in the near future, putting pressure on stocks that are already overexploited. In the territorial waters of Panama there is a constant struggle between commercial vessels with high yield, subsistence fishermen trying to feed a remote village, and ecosystem services struggling to sustain themselves. These services are the direct and indirect benefits received by the population in the form of food, raw materials, nutrient cycling, and disaster regulation. They are being degraded by illegal and unregulated fishing, bottom trawlers raking the benthos and destroying coral reefs, longlines responsible for thousands of sea turtle and bird deaths, and purse seines that decrease species biodiversity in fish stock. While the government has passed laws to reduce the environmental impact the industrial fisheries have, they lack effective enforcement. An alternative approach is to place monetary values on ecosystem services to show the monetary value of previously unrepresented natural capital. Application of this method to fisheries management can educate policy makers on the economic losses to expect if overfishing of the seas continues and provide the economic imperative to lessen impacts on oceanic ecosystems. Through comparative analysis it is shown that the market value of all fish catch in Panamanian waters is less than that which is provided by the ecosystem services in the area. Open ocean and coral reef ecosystem services provide a combined $103 billion per year while the highest grossing fish catch in Panamanian waters managed to net $356 million in 2004. There is an economic and political imperative to protect and promote sustainability of not only the fish stock, but all ecosystem services in the ocean.
1097

Economic Valuation Of Florida Sea Turtles In Face Of Sea Level Rise

Hamed, Ahmed 01 January 2013 (has links)
Sea level rise (SLR) is posing a great risk of flooding and inundation to coastal areas in Florida. Some coastal nesting species, including sea turtle species, have experienced diminished habitat from SLR. In an effort to assess the economic and ecosystem service loss to coastal areas with respect to sea turtles Contingent Valuation Method (CVM) and Habitat Equivalency Analysis (HEA) were used. The CVM was used to measure the economic impacts of SLR on sea turtles. Open-ended and dichotomous choice CVM was used to obtain the willingness to pay (WTP) values of Florida residents to implement certain mitigation strategies which would protect Florida’s east coast sea turtle nesting areas. The problem of sample selection bias was reduced by surveying residents of two cities that would potentially have varying interest in coastal conservation due to their relative distance from the coast. The hypothetical WTP of Florida households to implement policies designed to protect sea turtle habitat from development encroachment was estimated to be between $21 and $29 per year for a maximum of five years. Characteristics of respondents were found to have statistically significant impacts on their WTP. Findings include a negative correlation between the age of a respondent and the probability of an individual willing to pay the hypothetical WTP amount. Counter intuitively, it was found that WTP of an individual was not dependent on prior knowledge of the effects of SLR on sea turtle habitat. As the level of this awareness increased, the probability to pay the hypothetical WTP value decreased. The greatest indicators of whether or not an individual was willing to pay to protect sea turtle habitat were the respondents’ perception regarding the importance of sea turtle population health to the ecosystem, and their confidence in the conservation methods used. iii Concepts of Habitat Equivalency Analysis were used in order to determine the ecosystem service lost due to SLR. The study area of Archie Carr National Wildlife Refuge (ACNWR) has a continually increasing sea turtle population due to various conservation efforts. However, how the inundation of the coastal area will injure this habitat was assessed, and if mitigation strategies to compensate for the loss are necessary. The carrying capacity (CC) of the refuge was chosen as the metric of the ecosystem service. Using the estimated area of ACNWR and the approximate area needed by a sea turtle to nest, the theoretical number of sea turtle nests possible on the refuge was calculated. This value was then projected to the year 2100 using the sea level rise scenarios provided by IPCC (2007) and NRC (2010). In order to quantify the injury caused by the decrease in the refuge’s CC, the number of sea turtle nests on the refuge was projected to the year 2100 using the data obtained over the past 30 years. The analysis concludes a potential loss of service to be experienced as early as 2060’s due to the carrying capacity of the refuge diminishing with the loss of the habitat due to the increase in the mean sea level.
1098

Attractiveness of English Thyme (Thymus vulgaris L.) to Arthropod Natural Enemies and Its Suitability as a Dual Use Resource

Van Wert, Kristina K 01 June 2020 (has links) (PDF)
Current agroecosystem management practices have a negative effect on natural enemies and their ability to control insect pests. Conservation biological control through the addition of flowering resources can manage food resources for natural enemies. These floral resources can also provide multiple ecosystem services. Study goals were to determine if perennial Thymus vulgaris L. was attractive to natural enemies and if so, could it be a dual use resource encouraging pest management and providing harvestable product. In 2018 plots in three locations were used to examine the effect of habitat throughout the growing season on the attractiveness of T. vulgaris. Large numbers of Thysanoptera and Hemiptera were collected in all locations, represented by phytophagous Aphididae and Thripidae, and predatory Anthocoridae. Location influenced other families to varying degrees. Seasonal specimen counts were influenced by vegetation density, floral phenology, and predator/prey relationships. In 2019 replicated plots of three treatments were used to examine if harvesting plant material affected the attractiveness of T. vulgaris to natural enemies. Total specimens in 2019 were not significantly different among treatments, indicating removal of blooms did not significantly affect the attractiveness of T. vulgaris. Significant numbers of Thysanoptera and Hemiptera were again collected in all treatments, represented by phytophagous Aphididae and Thripidae. Greater numbers of Diptera and Hymenoptera were also collected. Significant numbers of Thripidae, Aphididae, Mymaridae, and Platygastridae were found in the Family level analyses. Results from both years indicate T. vulgaris was attractive to natural enemy and phytophagous Families. Data from 2018 suggest natural enemy families were attracted to alternative prey and hosts utilizing the foliage rather than flowers but the use of nectar and pollen cannot be ruled out. Data from 2019 suggest the presence of flowers played an important role in the attractiveness of T. vulgaris to micro-hymenopteran parasitoids, Syrphidae, and native Apidae. In conclusion, Thymus vulgaris has the potential to be a dual use floral resource that benefits growers through supporting native enemy populations and pollination services, as well as provide income from the harvest of foliage. It could also be used as a beneficial, harvestable floral resource in urban gardens to encourage pollinator conservation and natural pest control.
1099

Effects of Wildland Urban Interface Fuel Treatments on Fire Behavior and Ecosystem Services in the Klamath Mountains of California

Large, Jonathan A 01 August 2010 (has links) (PDF)
Greater numbers of people are moving into wildland-urban interface (WUI) areas, increasing the number of people at risk to large wildfires. To mitigate the hazard, emphasis is often placed on fuel treatments used to reduce fuel loads and subsequent fire behavior. This approach overlooks the additional benefits provided by vegetation, including carbon storage and sequestration along with air pollutant removal. This study aimed to calculate and compare differences in representative values by examining a study site in the Klamath Mountains of Northern California. Fire behavior simulations were done under various weather scenarios to illustrate both the impact of weather on fire intensity as well as the limitations of various fuel treatments. Ecosystem services were modeled using the I-tree Eco software (formerly the Urban Forest Effects model). Results showed a reduction in surface and an increase in canopy base height from the treatments and subsequent reductions in fire intensity under moderate and high conditions with the largest difference occurring in the Thin + Fire treatment. Under extreme weather conditions, the effectiveness of all fuel treatments was reduced. Ecosystem services showed a reduction of carbon sequestration in the fuel treatments corresponding to the reduction of smaller diameter trees from the fuel treatments. The greatest difference occurred in the Thin + Fire treatment. These results and the methods used to acquire them show the impacts from fuel treatments can be characterized and compared. This information will allow land managers to make decisions that account for a variety of considerations, while also providing them with tools that can facilitate the cooperation and collaboration of multiple stakeholders.
1100

The Influence of the Sensory Environment on Avian Reproductive Success and Human Well-Being

Ferraro, Danielle Marie 01 June 2020 (has links) (PDF)
Sensory pollutants such as anthropogenic noise and night lighting now expose much of the world to evolutionarily novel sound and night lighting conditions, which can have detrimental effects on humans and wildlife. In my first chapter, we exposed wild Western Bluebird (Sialia mexicana) nestlings to noise, light, and combination (i.e., noise and light) treatments. Nests exposed to noise and light together experienced less predation than control and light-exposed nests, and noise-exposed nests experienced less predation than control nests, yet overall nest success was only higher in noise-exposed nests compared to light-exposed nests. Although exposure to light decreased nestling body condition and evidence was mixed for the singular effects of noise or light on nestling size, those exposed to noise and light together were smaller across several metrics than nestlings in control nests. Our results support previous research on the singular effects of either stimuli, including potential benefits, such as reduced nest predation with noise exposure. However, our results also suggest that noise and light together can negatively affect some aspects of reproduction more strongly than either sensory pollutant alone. This finding is especially important given that these stimuli tend to covary and are projected to increase dramatically in the next several decades. In my second chapter, we used a field-based manipulation to explore the role of audition in biodiversity perception and self-reported well-being of hikers. We used a “phantom chorus” consisting of hidden speakers playing bird vocalizations to experimentally increase audible birdsong biodiversity during “on” and “off” blocks on two hiking trails and surveyed hikers to record their self-reported perceptions of avian biodiversity and concepts reflective of attention restoration. We found that hikers exposed to the phantom chorus reported higher levels of restorative effects compared to those that experienced ambient conditions on both trails, although the causal relationships differed for each trail. Specifically, increased restorative effects were directly linked to the phantom chorus on one trail and indirectly linked to the phantom chorus on the other trail through perceptions of avian biodiversity. Our findings add to a growing body of evidence linking mental health improvements to nature experiences and, via our field-based manipulation, we identified audition as an important modality by which natural environments confer well-being. Finally, our results suggest that maintaining or improving natural soundscapes within protected areas may be an important component to maximizing human experiences, especially as tourism and noise pollution in protected areas grow.

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